.one-loading {
    width: 100%;
    height: 100%;
    padding-top: 200px;
    box-sizing: border-box;
    background:rgba(0, 0, 0,0.3);
    position: absolute;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    top: 0;
    left: 0;
}